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Evaluation of Transfer Functions of Dual Porosity-dual Permeability Model Using Discrete Fracture Model

Baj, Arash | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48927 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghizadeh Manzari, Mehrdad; kazemzadeh Hannani, Siamak
  7. Abstract:
  8. Physics of present work is 2D and two phase immiscible flow under gravity and capillary effect through fractured porous media. Rock properties such as porosity and permeability are homogenous. Discrete fracture model and dual porosity-dual permeability model are used to simulate this problem. Governing equations for such reservoirs are conservation of mass and conservation of momentum. Evaluations are performed in two seperate parts. in the first part, geometry, boundary conditions and initial conditions which important models of transfer functions were calculated are provided by using discrete fracture model and results are compared with results of corresponding reference. Following transfer functions are checked: Kazemi transfer function (1976), Coats transfer function (1989), Lim and Aziz transfer function (1995) and Rangel-German transfer function (2006). in evaluations of transfer functions in this part, pressure distribution in matrix block, changes of average pressure of matrix block according to time and transferred flux between matrix and fracture are considered. in the second part of evaluations one certain problem will be solved by both discrete fracture model and dual porosity-dual permeability model and results of different models of transfer function in dual porosity-dual permeability model are compared with results of discrete fracture model. control volume finite element method (CVFEM) is used to implement discrete fracture model and for dual porosity-dual permeability model, numerical method is finite volume method and in both models IMPES technique is used to solve equations which is a common techniquein reservoir simulation. According to this research’s results, main differences between transfer functions will be determined and one can see which transfer function predicts the reservoir’s behavior closer to the exact results (discrete fracture results)
  9. Keywords:
  10. Porous Media ; Two Phase Flow ; Transfer Function ; Dual Permeability ; Dual Porosity ; Naturally Fractured Reservoir ; Discrete Fracture

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